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United States Patent | 6,074,172 |
Huang | June 13, 2000 |
A controller is provided to control and fix the stroke and frequency of the piston movement of the compressor under various operating conditions. The controller includes a signal generator for providing a first signal, a detector generating a second signal after detecting that the piston has a displacement, and a signal processing unit electrically connected to the signal generator and the detector for outputting a control signal to the compressor after receiving the first signal and the second signal to control a movement of the piston.
Inventors: | Huang; Bin-Juine (Taipei, TW) |
Assignee: | National Science Council (Taipei, TW) |
Appl. No.: | 041078 |
Filed: | March 11, 1998 |
Sep 26, 1997[TW] | 86114103 |
Current U.S. Class: | 417/214; 318/127; 417/212 |
Intern'l Class: | F04B 049/12 |
Field of Search: | 417/415,212,45,326,63,214 62/6,228.1 318/119,127,129 |
3659968 | May., 1972 | Thomas, Jr. et al. | 417/417. |
4353220 | Oct., 1982 | Curwen et al. | 62/228. |
4613285 | Sep., 1986 | Sato et al. | 417/214. |
4772828 | Sep., 1988 | Heymans et al. | 318/128. |
5535593 | Jul., 1996 | Wu et al. | 62/6. |
5836165 | Nov., 1998 | Champion et al. | 62/6. |
5947693 | Sep., 1999 | Yang | 417/45. |